Can someone tell me if it is possible to convert a file
that was developed using the SLC Logistics software by ICOM to an (*.RSS) file that can be read by RSLogix500? Will Logix500 open this file as is?

There are eight files associated with the project. Their extensions are: .dfg (70kb), .slc(3kb), .sld(27kb), .slf(1kb), .slp(8kb), .slr(26kb), .slt(1kb), and .slx(8kb). I do not know which one contains the ladder.

No, it can't be converted to Logix500... The addressing and instructions are different. To open that, you need PCIN from AB, I don't have a copy here, but might have one at home. I'll look around if needed.